1 /* 2 * Misc. bootloader code for many machines. 3 * 4 * Copyright 2001 MontaVista Software Inc. 5 * Author: Matt Porter <mporter@mvista.com> Derived from 6 * arch/ppc/boot/prep/misc.c 7 * 8 * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology 9 * Author: Wu Zhangjin <wuzj@lemote.com> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 */ 16 17 #include <linux/types.h> 18 #include <linux/kernel.h> 19 20 #include <asm/addrspace.h> 21 22 /* These two variables specify the free mem region 23 * that can be used for temporary malloc area 24 */ 25 unsigned long free_mem_ptr; 26 unsigned long free_mem_end_ptr; 27 char *zimage_start; 28 29 /* The linker tells us where the image is. */ 30 extern unsigned char __image_begin, __image_end; 31 extern unsigned char __ramdisk_begin, __ramdisk_end; 32 unsigned long initrd_size; 33 34 /* debug interfaces */ 35 extern void puts(const char *s); 36 extern void puthex(unsigned long long val); 37 38 void error(char *x) 39 { 40 puts("\n\n"); 41 puts(x); 42 puts("\n\n -- System halted"); 43 44 while (1) 45 ; /* Halt */ 46 } 47 48 /* activate the code for pre-boot environment */ 49 #define STATIC static 50 51 #ifdef CONFIG_KERNEL_GZIP 52 void *memcpy(void *dest, const void *src, size_t n) 53 { 54 int i; 55 const char *s = src; 56 char *d = dest; 57 58 for (i = 0; i < n; i++) 59 d[i] = s[i]; 60 return dest; 61 } 62 #include "../../../../lib/decompress_inflate.c" 63 #endif 64 65 #ifdef CONFIG_KERNEL_BZIP2 66 void *memset(void *s, int c, size_t n) 67 { 68 int i; 69 char *ss = s; 70 71 for (i = 0; i < n; i++) 72 ss[i] = c; 73 return s; 74 } 75 #include "../../../../lib/decompress_bunzip2.c" 76 #endif 77 78 #ifdef CONFIG_KERNEL_LZMA 79 #include "../../../../lib/decompress_unlzma.c" 80 #endif 81 82 void decompress_kernel(unsigned long boot_heap_start) 83 { 84 int zimage_size; 85 86 /* 87 * We link ourself to an arbitrary low address. When we run, we 88 * relocate outself to that address. __image_beign points to 89 * the part of the image where the zImage is. -- Tom 90 */ 91 zimage_start = (char *)(unsigned long)(&__image_begin); 92 zimage_size = (unsigned long)(&__image_end) - 93 (unsigned long)(&__image_begin); 94 95 /* 96 * The zImage and initrd will be between start and _end, so they've 97 * already been moved once. We're good to go now. -- Tom 98 */ 99 puts("zimage at: "); 100 puthex((unsigned long)zimage_start); 101 puts(" "); 102 puthex((unsigned long)(zimage_size + zimage_start)); 103 puts("\n"); 104 105 if (initrd_size) { 106 puts("initrd at: "); 107 puthex((unsigned long)(&__ramdisk_begin)); 108 puts(" "); 109 puthex((unsigned long)(&__ramdisk_end)); 110 puts("\n"); 111 } 112 113 /* this area are prepared for mallocing when decompressing */ 114 free_mem_ptr = boot_heap_start; 115 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; 116 117 /* Display standard Linux/MIPS boot prompt for kernel args */ 118 puts("Uncompressing Linux at load address "); 119 puthex(VMLINUX_LOAD_ADDRESS_ULL); 120 puts("\n"); 121 /* Decompress the kernel with according algorithm */ 122 decompress(zimage_start, zimage_size, 0, 0, 123 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error); 124 /* FIXME: is there a need to flush cache here? */ 125 puts("Now, booting the kernel...\n"); 126 } 127